Models & Labs

Kimi K3 vs GPT-5.6 Sol: Cost and Performance

Together AI BlogJuly 26, 2026high confidence

Why it matters

→Kimi K3 offers a cost-effective solution for high-volume tasks, outperforming Sol in multi-attempt scenarios.
→GPT-5.6 Sol provides higher reliability in single-shot tasks, making it suitable for critical applications.
→A combined routing strategy leverages both models' strengths, maximizing task coverage and efficiency.

Kimi K3 vs GPT-5.6 Sol: Cost and Performance — ©Together AI Blog

Kimi K3 and GPT-5.6 Sol have been compared on the DeepSWE benchmark, revealing unique strengths for each model. GPT-5.6 Sol leads in single-attempt quality with a pass@1 score of 72.7%, while Kimi K3 excels in scenarios with multiple attempts, achieving a pass@4 score of 89.4%. Kimi K3 is also more cost-effective, providing 2.8 times more solved tasks per dollar than Sol. The models' differing strengths suggest that using a routing strategy, where tasks are first attempted by Kimi K3 and escalated to Sol if necessary, could optimize performance and cost-efficiency.

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